There is some high-intensity stuff, but also lots of reps. In general the workouts are 10min - 30min long. you can see some of the standard ones here:

http://www.crossfit.com/cf-info/faq.html#WOD0

Fran, Nancy, Cindy, and Diane are some of the ones I've heard mentioned a lot.

There are workouts like "5-5-5-5-5 reps" of a weightlifting move, where the weight is the max you can do that rep scheme at. They occasionally do 1-1-1-1-1-1-1, but not often.